There are two things you need to do:
- Set up $TEMPLATEDIR in FormMail's configuration section
- Add an "autorespond" hidden field to your form.
If you place your auto response text file in the same folder as FormMail, then you can set $TEMPLATEDIR like this:
The "." means "current folder" - i.e. the same folder that FormMail is running in.
$TEMPLATEDIR = ".";
Then, in your HTML add this hidden field:
That should be everything since you already have Reverse Captcha running.
<input type="hidden" name="autorespond" value="PlainFile=name-of-file.txt" />
I can set that up for you if you prefer.